I used the Hornady InterBond 154 grain in my 7mm Weatherby Magnum this fall, and factory loaded they quote 3200 fps. Struck the elk head on and penetrated all the way back to the left flank - not at all a short distance. Elk immediately went to its knees and it was all over.

FYI, the Interlock bullet from Hornady has stories out there more similar to what you describe; are you sure it was the InterBond? Just asking, that's all.

No mistake, 85 grain INTERBOND. Maybe the speed was just too fast for the bullet. The swift sciracco's perform better in that caliber. I am not saying that all interbonds blow up, just this particular one in .243.